Behind its dramatically restyled front fascia, the 2014 Corvette Stingray packs a new 450-hp 6.2-liter V8 engine. Not surprisingly, that engine isn't quite powerful enough for some gear-heads. Well before the new 'Vette makes its way into showrooms later this year, Hennessey Performance is teasing potential buyers with a version that puts out more than double the horsepower.